Build and Run not working

I am using Unity on Mac and made a very simple game to learn the basics. When I play the game within Unity itself, everything works as it is supposed to. However, when I try to build and run the game as an app, what happens is that I get the “Made with Unity” screen, my character appears and then just falls through the floor. My spacebar is not registered and my claws do not spawn in etc. I was following this tutorial “The Unity Tutorial For Complete Beginners” by Game Maker’s Toolkit and everything I did should be the same.

Here are some videos on Drive I have taken to show the issues

In Unity

GIF24.01.202411-47-58-ezgif.com-optimize

Screen Recording 2024-01-24 at 10.35.14 AM.mov - Google Drive

After Build & Run

Screen Recording 2024-01-24 at 10.35.14 AM.mov - Google Drive

Ah sorry, here is the 2nd recording: Screen Recording 2024-01-24 at 10.44.26 AM.mov - Google Drive

@yonatanab1 what do you mean by input system? I use spacebar to make the alien jump if thats what you mean